From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E0EFC433E1 for ; Fri, 22 May 2020 14:52:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 223012145D for ; Fri, 22 May 2020 14:52:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590159170; bh=DYY57umynyFAZK/twDxMmZVr1Hq81x9GD9DqV30xJ0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Fad7l5O3Cfl6FeGgOm038wfARES65SHrJ2mVUCf4rk1S1Hi5+FqSdaekdV14Q88+o KP2oaaIRHnDC7CsoUYEQGb/3HzEQvX/cOEvyNn40Tw4CLAVDZSVRqIG9zNCMK1qRZ/ FVb8xhpfzOQvjnIPRJLUMfQyqtK0QEVAg/z9uk3Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730665AbgEVOws (ORCPT ); Fri, 22 May 2020 10:52:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:54694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731211AbgEVOwK (ORCPT ); Fri, 22 May 2020 10:52:10 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3C658221FF; Fri, 22 May 2020 14:52:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590159129; bh=DYY57umynyFAZK/twDxMmZVr1Hq81x9GD9DqV30xJ0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vjaoTUzsAAlzq+/L0SsUq/dTvPUFgig/oHEU6gOvTI1FBgrcrii9QntmOZNe8D1UL iD+eroRlPhwt/sv3MGStZJzMGxnHaLZRPBbe01x86SmkYX9Lg54amhxX7vxXxD+kZH MVqmixMzDDfyZRuU1/mi4mGl7vRjedyoiIfzSzGg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bob Peterson , Sasha Levin , cluster-devel@redhat.com Subject: [PATCH AUTOSEL 4.4 2/5] Revert "gfs2: Don't demote a glock until its revokes are written" Date: Fri, 22 May 2020 10:52:04 -0400 Message-Id: <20200522145207.435314-2-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200522145207.435314-1-sashal@kernel.org> References: <20200522145207.435314-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bob Peterson [ Upstream commit b14c94908b1b884276a6608dea3d0b1b510338b7 ] This reverts commit df5db5f9ee112e76b5202fbc331f990a0fc316d6. This patch fixes a regression: patch df5db5f9ee112 allowed function run_queue() to bypass its call to do_xmote() if revokes were queued for the glock. That's wrong because its call to do_xmote() is what is responsible for calling the go_sync() glops functions to sync both the ail list and any revokes queued for it. By bypassing the call, gfs2 could get into a stand-off where the glock could not be demoted until its revokes are written back, but the revokes would not be written back because do_xmote() was never called. It "sort of" works, however, because there are other mechanisms like the log flush daemon (logd) that can sync the ail items and revokes, if it deems it necessary. The problem is: without file system pressure, it might never deem it necessary. Signed-off-by: Bob Peterson Signed-off-by: Sasha Levin --- fs/gfs2/glock.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index f80ffccb0316..1eb737c466dd 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -541,9 +541,6 @@ __acquires(&gl->gl_lockref.lock) goto out_unlock; if (nonblock) goto out_sched; - smp_mb(); - if (atomic_read(&gl->gl_revokes) != 0) - goto out_sched; set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags); GLOCK_BUG_ON(gl, gl->gl_demote_state == LM_ST_EXCLUSIVE); gl->gl_target = gl->gl_demote_state; -- 2.25.1